Drill and countersink tool



March 9, 194s. L, AfSMlTH y 2,437,364

DRILL AND COUNTERSINK TOOL Filed May 5, 1944 ,MIIIIIIIII INVENTOR. awo-0f?. /1-

BY www A T TOR/YE Y Patented Mar. 9'1948 Unirse As'rnrlzs PATENT OFFICE DRILL (,s'fRSlNK-TOOL Y k .Lawson A. Smith, Los Angeles, Calf.,.assi gnor .to

.Robert H. Clark, Los .'Angeles, Calif.

rApplication May 5, 1944, Serial No. 534,197

2.4 ).Claims. (Cl. f77-665) This .inventionhas to do with a "tool .and has particular .reference to sa. tool which operates to :both and counter-sink. .It .is a general 4orriect .of my invention to provide a .tool of 'the rcharacter described winch is simple, effective, .and sturdy and .also is lsubject to variation so that it can be used to drill various size ,holes and to have 'Marions fcountersi-nking factions.

.It :desired in practice 'to ,provide holes .-i-n metal. `or the like., which :holes are :counterbored Vor ccuntersunk to receive :partsfsuch .as .the ,heads 'of screws, bolts, (or other .such parts. It is common practice y.to drill such .holes with .ordinary and then operate on :them with :devices known as icnuntersiniks :involves two .operyations and. consequently, consumes .considerable time and is costly.

it :is .an `object of any irmenticn to provide a .practical and @satisfactory :tool which ywill .operionm in one operation a drilling operation and a r-eountersinking operation.

.Another :obiect of my invent-ion is .to provide 4a. tool of :thecharacter mentioned which .is simple, compact .and practical .in .Af-.crm making .it suitable .for .general .use.

.Another object of the present .invention .is to provide a tool -of the character .described which will handle standard forms or types -of drills and -in .which .the body .is .comparatively small :and compact and is reinforced, making .it strong .and durable. .Y Y

VThe various objects and .features of .my .invention willbe :fully understood from :the followling detailed vdescription Aof .a typical .preferred 'form and .application of the invention, 4throughout 'which description reference is made .to the accompanying drawings, in which:

Fig. l is a side elevation of the tool provided "by vmy invention. Fig. .2 is a 4vview 'taken ,as indicatedby 'line 2'-'2 'on l. I'Fig. '3 is a transverse sectional view taken as indicated by line 8-3 on Fig. '1. Fig. 4 is a ltransverse sectional view vtaken :as indicated by li-ne '4 4 on Fig. 1, and Fig. *Sis a l*transverse sectional view 4taken 'as indicated by line 5-5 on Fig. l.

The toolc'f :my present invention involves, 'generally a body I0, a shank Il carryingthe body, fa -'dri1l 4,3 lcarried by 'the body to project there- 'from at ithe end `opposite 'the shank, countersink cutters I 4 .carried 'by the @body to vcooperate 'with vthe drill, means l5 for retaining for holding the :countersin'k cutters, and means 16 for rein-forcing ythe body.

The body :of the itool the part `which serves os amounting "or k'carrier- :for Sthe various other Ielements and, Ein practice, ymay be .varied in `size and ysha-"pe, 4as circumstances require. It is apre- ;ferred 'to lmake the body as :small :in diameter as is `consistent with .strength .fand rigidity and to Lconne it Ain length so that it is as compact las Vpossible length-wise fof the tool. 'The preferred term .or body illustrated in .the :drawings is )round in Across-section and .is made just .sufficiently :long lto adequately carry the various other elements, as iwi-ll 'be apparent .from the drawings.

'The .shank '|.fl projects lf-rom vone fend, dor `instance, lthe-upper end ofithe :body .IiiLandserves as a means for :connecting the .tool :in a machine, or the like. accordance withstandard practice il have provided Ja tapered shank, it being Iunderstood that in practicethe .shank 4may beiof any desired Lform,sshapeor type ascii'- ycums'tances require.

' "I'he drill t3 employed in carrying [out .my .in-

vention has a working .end portion :20 which maybe in theA form of an ordinary twist drill 'familiar -to those ski-lied "in the art. 'The upper r-end or `stern 2l :of lthe .drill is, in accordance .with my invention, round in cross-section, except that lit fis provided with diametricalrly opposite ilat Asides 22.

The body 10 is provided with a 'bore lor socket 23 which extends into it irorn its Alower end to 4receive vzand carry .the stein 2l .-of the drill. In practicar-,he ftool may Abe :equipped with drills `of various sizes so long as the stem :thereof is vof a size to be -properlyaccommodated 4by :the :socket 23 ci the body.

The countersink cutters, :of which there are preferably two, arranged vin diametrically opposite sides -o'f 4the bod-y, are alike :and each iis arranged in a channel Sil Acut in the side =of the body. :'Each `countersink cutter, as show-n in the drawings, includes la body porti-on v3| which iis substantially rectangular 'zin cross .section .and vwhich :fits the channel vil-in thebody. The .chan- :nelsi Vare pitched or :angularly disposed relative to .the longitudinal .axis .of the .tool v.and v`so that the cutters extend downwardly Vand Voutwardly .as will be apparent from "the drawings. The lower K'or projecting end portion .of each acutiter 2|.4 has .a .cutting edge .34 faced in the direction .of .rotation .of `tl'ie tool .and pitched relative :to

the axis .of the tool .or .relative to Athe drill :to have the desired .countersinkine action.

A feature of the presentinvention is the 'formation of the channels 'in the sides of :the body or 5in oppositesides fojf the lbody-sozthat theydntersect the vsocket `:23 l:in .the .body 'whichecarries the rstein :offzthe drill ssothat ythe inner sides 1.36 of the body 3 portions 3| of the cutters bear upon the flat sides 22 of the stem of the drill. Through this arrangement I obtain a compact construction and the cutters serve to prevent rotation of the drill stem in the body.

The means I5 provided for retaining the cutters in the channels 3B of the body may vary as circumstances require. In the preferred form of the invention each cutter is retained in its channel by a clamp plate 40 carried by a screw il threaded in an opening in the body so that the plate is clamped toward the body and overhangs the body 3l of the cutter to clamp it in the channel and against the stem of the drill. In the construction illustrated I have shown the clamp plates 4l) countersunk at 44 to receive the heads l5 of the screws and the screw heads 45 have countersunk sockets 4B to receive a wrench, or the like. This provides an effective compact construction. A

The means provided for reinforcing the body I is in the form of a tie pin 60 arranged to connect the two spaced side parts A and B of the body formed by the cuts made in the body to make the socket 23 and channels 30, as will be apparent from Fig. 4 of the drawings. The tie pin extends between the spaced body parts A and B and has one end threaded in the body part A and has a head 62 on its other end seated in a socket in the body part B. The tie pin may be arranged at a-point where the stern of the drill occupies the socket 23, in which case an opening 65 is provided transversely through the stem of the drill to pass the tie pin as is shown in Fig. 4.

The lower end portion 5D of the body lll is downwardly and inwardly tapered so it is in the form of an inverted truncated cone. The channels 3 continue into this portion of the body so that the lower or cutting end portions of the cutters bear on the sides of the stem 2l and are held by the body at points very close `to the working or cutting edges, thus giving the cutters effective support. This is shown in Fig. 5 of the drawings.

With the construction provided by my invention a drill of suitable size is mounted in the body and countersink cutters I4 of the desired size and shape are arranged in the channels 3D so that their cutting end portions project from points close to the flattened sides of the drill stem and extend at the desired angles. By this construction or arrangement the path of cut of the drill is overlapped by the path of cut of the ccuntersink cutters so that the tool operates to countersink the bore without leaving any burrs or rough edges. It will be apparent how the means I5 serve to firmly and effectively hold the countersink cutters in the channels of the body and how the cutters, in turn, bear against the flat sides of the drill stern to hold the drill against turning. The reinforcing means serves to tie the body parts A and B together and also serves to' retain the drill in the body and to prevent its turning.

Having described only a typical preferred form and application of my invention, I do not wish to be limited or restricted to the specific details herein set forth, but wish to reserve to myself any variations or modiiications that" may appear to those skilled in the art or fall within the scope of the following claims. l Having described my invention, I claim:

1. A tool of the character described including, a body having a mounting shank at one end and having a diagonally disposed straight channel in its side and a socket in it from its other end, a drill having a stern held in the socket and a cutting portion beyond said other end of the body, and a straight elongate countersink cutter held in the channel with a cutting part overlapping the drill and acting in a path overlapping that of the drill and projecting laterally outward from one side of the drill. Y

2. A tool of the character described including, a body having a diagonally disposed channel in its side and a socket in its outer end, a drill having a stem engaged in the socket, and a countersink cutter held in the channel with a cutting part acting in a path overlapping that of the drill and projecting laterally outward from one side of the drill beyond the said end of the body, the socket and channel intersecting so the cutter engages the stem within the body.

V3. A tool of the character described including, a body having a diagonally disposed channel in its side and a socket in its outer end, a drill having a flat sided stem held in the socket, and a countersink cutter held in the channel with a cutting part projecting from one side of the drill, the socket and channel intersecting in the body so the cutter engages one of the nat sides of the stem within the body.

4. A tool of the character described including, a body with a downwardly and inwardly tapered lower end portion and having a diagonally disposed channel inits side and throughsaid lower end portion, the body having a socket in its lower end, a, drill having a stem engaged in the socket,

and a countersink cutter held in the channel with a cutting part .immediately below'the said end portion of the body and projecting from` one side of the drill. Y

5.' A tool of the character described including, a body with a mounting shank at its upper end and with a downwardly and inwardly tapered lower end portion and having a diagonally disposed channel in its side and a central socket in its lower end, a drill having a stern held in the socket, and a countersink cutter held in the channel with a cutting lpart supported by the tapered portion of the body and projecting from one side of the drill immediately below the said portion of the body.

6. A tool of the character described including, an integral body having its lower end por-v tion divided by a central socket and side channels that intersect the socket, a drill having Aa stem carried in the socket, cutters carried in the channels, and reinforcing meansV securing the lower end portions of the body together where it is divided.l

7. A tool of the character described including, an integral body with a mounting stern at its upper end and having its lower end portion divided by a central socket entering it from. the lower end and side channels that intersect the socket, a drill having a stem carried in the socket, cutters carried in the channels to bear laterally on the stem within the socket, and reinforcing means securing the lower end portions of the body together.

8. A tool of the character Vdescribed including, an integral elongate body having itsV lower end portion divided by a central socket and side channels that intersect the socket, a drill having a stem carried in the socket, cutters carried in the channels, and reinforcing means tying theY Ween the' them.

divided 'parts oithel body vto connect 9. A Ytool of the character described including, a 4body havingits lower end portion divided by a central socket and side channels that intersect the socket, a drillhaving a stem carried in the socket, the stem having an opening therethrough cutters carried in the channels at opposite sides of the stem, andreinforcing means securing the divided lower end portions of the body together including a pin arranged between the divided parts of the-body and through the opening in the stem.

10. A tool of the character described including, a bodywith a mounting shank at its upper end and having a socket in it vfrom its lower end to receive the stem of a drill and having a tapered lower end portion and having channels intersecting the socket bifurcating'the body soit has spaced lower end parts, a drill having a stem engaged in the socket, cutters in the channels bearing on the stem, and means connecting the said spaced parts of the body tying them against spreading.

11. A tool of the character described including, a body with a mounting shank at its upper end and having a socket in it from its lower end to receive the stem of a drill and having a tapered lower end portion and having channels intersecting the socket bifurcating the body so it has spaced parts, a drill having a at sided stem engaged in the socket, cutters in the channels bearing on the flat sides of the stem, and means connecting the spaced parts of the body against spreading.

l2. A tool of the character described including, a body having a socket to receive the stem of a drill and having a tapered lower end portion and having channels in its sides and intersecting the socket dividing the body into spaced parts, a drill having a stem in the socket, cutters in the channels bearing on opposite sides of the stem, and a pin connecting the spaced parts of the body, the pin being threaded to one part and having a head bearing on the other part.

13. A tool including, a body with a mounting shank at one end and having a central socket entering it from the other end, there being a channel in the side of the body intersecting the socket within the body, a centrally disposed member with a stem portion engaged in the socket, and a cutter carried in the channel to have a part bearing on the side ofthe stem portion within the socket.

14. A tool including, a body with a mounting shank at one end and having a central socket entering it from the other end, there being a channel in the side of the body intersecting the socket within the body, a centrally disposed member with a stem portion engaged in the socket, a cutter carried in the channel to have a part bearing on the stem portion within the socket, and a single screw member retaining the cutter in the channel and in pressure engagement with the side of the stem portion to retain the stem in the socket.

15. A tool including a body with a mounting shank at one end and a central socket entering it from the other end, and a channel in the side of the body intersecting the socket within the body, a centrally disposed member having a flat sided stem received in the socket and having a part projecting from said other end of the body, and a cutter held in the channel and engaging the dat side of the stem to hold the stem.

16. A tool including a bodywith av mounting shank at one end and a central socket entering iis-'from the other end, andA 'a diagonally disposed channel in the sid'ofthe body intersectingV the socket -within the body, a centrally disposed member having a flat sided stem received in the socket and having a part projecting from said other end-of the body, and a cutter held Vinthe channel fand engaging the fiat side of the stein to hold-the stem and having a cutting'part .beyond the said other end of the body;

17. A tool of the character described including, an integral bodyfhaving its lower portion divided by a central socket and side channels that intersect the socket, a drill having a stem carried in the socket, cutters carried in they channels, and means retaining the cutters in the channels and also in bearing engagement with the stem. and re inforcing means securing the lower end portions of the body together.

18. A tool of the character described including, an integral body having its lower end portion divided by a central socket and side channels that intersect the socket, a drill having a, at sided stem carried in the socket, cutters carried in the channels engaging the at side of the stem,

. and reinforcing means securing the lower end portions of the body together.

19. A tool of the character described including, an integral body having its lower end portion divided by a central socket and side channels that intersect the socket, a drill having a stem carried in the socket, cutters carried in the channels, and reinforcing means tying the lower end portions of the body together including a pin arranged between the divided parts of the body to connect them, the 10111 having a head countersunk into one part of the body and having a threaded end engaged in the other part of the body, there being no part of the pin projecting from the body.

20. A tool of the character described including, a body with a mounting shank at its upper end and having a socket in it from its lower end to receive the stem of a drill and having a tapered lower end portion and having channels intersecting the socket bifurcating the body so it has spaced parts, a drill having a flat sided stem engaged in the socket, cutters in the channels bearing on the fiat sides of the stem, a single means retaining the cutters in the channels and forcing them into bearing engagement with the stem, and means connecting the spaced parts of the body against spreading.

21. A tool of the character described including, a body having a socket to receive the stem of a drill and having channels at opposite sides intersecting the socket dividing body into spaced parts, a drill having a stem in the socket, cutters in the channels bearing on the stem, clamp means extending laterally of the body and engaging the cutters to hold them in the channels, and a pin at right angles to the clamp means and connecting the spaced parts of the body, the pin being threaded to one part and having a head bearing on the other part.

22. A tool of the character described including, an elongate body having a socket in its lower end to receive the stem of a drill and having side channels intersecting the socket dividing the lower end portion of the body into spaced parts, a drill having a stem in the socket, cutters in the channels bearing on the stem, clamp means holding the cutters in the channels, and a pin conf clamp means in the direction of the lower. end of the body.

23. A tool of the character described including, an elongate body having a socket in its lower end to receive the stem of a drill and having side channels intersecting the socket dividing the lower end portion of the body into spaced parts, a drill having a stem in the socket, cutters in the channels bearing on the stem, clamp means extending transversely of the body and holding the cutters in the channels, and a pin connecting the spaced parts of the body, the pin being disposed at right angles to the clamp means and axially removed from the clamp means in the direction of the lower end of the body.

24. A tool including a body with a mounting shank at its upper end and having inclined channels in opposite sides, cutters in the channels to project downkand out from the body, and screw 8 members threaded to the body adjacent the channels to clamp the cutters in the channels, the screw members being in a common transverse plane and being laterally oset and extending into the body to pass Within the body.

LAWSON A. SMITH.

REFERENCES CITED The following references are of record in the le of this patent:

UNITED STATES PATENTS Number Name Date 336,762 Smith Feb. 23, 1886 687,724 Cadell Dec. 3, 1901 1,622,094 Decker Mar. 22, 1927 2,057,769 Dowling et al. Oct. 20, 1936 2,340,941 Dietz Feb. 8, 1944 

